Commit 7ef4c19d245f3dc2 ("smackfs: restrict bytes count in smackfs write
functions") missed that count > SMK_CIPSOMAX check applies to only
format == SMK_FIXED24_FMT case.
Reported-by: syzbot <syzbot+77c53db50c9fff774...@syzkaller.appspotmail.com>
Signed-off-by: Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp>
---
security/smack/smackfs.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 22ded2c26089..1ad7d0d1ea62 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -855,6 +855,8 @@ static ssize_t smk_set_cipso(struct file *file, const char
__user *buf,
if (format == SMK_FIXED24_FMT &&
(count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
return -EINVAL;
+ if (count > PAGE_SIZE)
+ return -EINVAL;
data = memdup_user_nul(buf, count);
if (IS_ERR(data))
--
2.18.4
